Unidirectional surface acoustic wave device with meandering elec

Details Unidirectional surface acoustic wave device with meandering elec Unidirectional surface acoustic wave device with meandering elec

1982-05-04

1983-12-20

Miller, J. D.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, 333154, H03H 9145

Patent

active

044220006

ABSTRACT:
A surface acoustic wave device on a piezoelectric substrate comprises an interdigital transducer having an interdigital sending part in the forward direction and an interdigital reflecting part in the reverse direction. An electrical phase difference of .phi. (radian) is applied between the sending and reflecting parts, while the distance between the sending and reflecting parts providing a geometrical phase difference therebetween is established to be ##EQU1## where n is a positive integer and .lambda..sub.o is the wavelength of surface acoustic wave. A third, common electrode meanders between the sending and reflecting electrodes.

REFERENCES:
patent: 2894221 (1959-07-01), Coy
patent: 3686518 (1972-08-01), Hartmann et al.
patent: 3866154 (1975-02-01), Moore
patent: 4267533 (1981-05-01), Dempsey et al.
Shimizu, Y., et al., "Unidirectional SAW Transducer by Meandering and Interdigital Electrodes", Trans. of IECE, vol. E61, No. 7, pp. 557, 558.

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